Popular 104E starter motor problem

[Smoothmachines]

I have some trouble with the starter motor/starting on a 1954 Popular 103-104E.

The motor turns the engine but as soon as the engine coughs, the starter motor would release and turn unloaded.

I tried a replacement starter motor but the shaft was bent and it got stuck before even turning.

Then i moved the spring loaded pinion a bit further so it would come out a bit more, by removing the cotter pin and losening the retaining nut a few turns.

I checked the function out of the car and it seems normal.

It seemed to work but the engine was warm and started lite a dream even with the silly starter motor.

With the engine cold it would release as soon as the engine coughs.

I suspect the car only works on 3 cylinders, i will try for compression on both valves and piston rings.

But it should start anyway, new plugs, clean ignition system, good battery, idle adjusted etc.

The starter gives me a headache, what could possibly cause the pinion to jump back so soon, it is not even worn?

 

[colr6]

Starter not spinning fast enough to keep it in so when the engine coughs it speeds up a bit and kicks it out ?

[Smoothmachines]

Starter not spinning fast enough to keep it in so when the engine coughs it speeds up a bit and kicks it out ?

That would be quite enough, you´re absolutely right, did not think of that. 

Maybe the starter needs som maintenance? 

Would bad brushes be enough to cause that?

[colr6]

A good possibility.

[Smoothmachines]

I will check that, not too soon but i´ll be back to tell. Thanks!